* {
	margin: 0;
	padding: 0;
}
#video {
	width: 100%;
	height: 350px;
	background: #000;
}
main {
	width: 100vw;
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	padding: 0 10px;
	box-sizing: border-box;
	position: relative;

	#lt {
		font-family: 宋体;
		font-size: 36px;
		color: #fff;
		position: absolute;
		top: -345px;
		left: 10px;
		z-index: 10;
	}

	#title {
		width: 100%;
		text-align: left;
		padding-left: 10px;
		border-bottom: 2px solid #ccc;
		position: relative;
		#exercise {
			position: absolute;
			font-size: 16px;
			color: #ccc;
			top: 52px;
			right: 10px;
		}
		h2 {
			margin-top: 10px;
		}
		p {
			margin: 10px auto;
			font-size: 14px;
			span {
				font-size: 16px;
				font-weight: bold;
				margin-left: 10px;
			}
		}
	}
	#btn {
		width: 90%;
		height: 60px;
		font-size: 18px;
		background-color: #4294ff;
		color: #fff;
		margin: 20px auto;
		border: none;
		border-radius: 30px;
		letter-spacing: 1.5em;
	}
}
